No abstract

Block-copolymers are known to generate nano-scale microdomains by microphase-separation, if they are annealed at a temperature lower than their order-disorder transition temperatures. We tried to transfer microdomains onto substrates by only using the reactive-ion etching method, which is widely used in semiconductor manufacturing processes. Block-copolymers consisting of an aromatic polymer and an acrylic polymer were used since there is a big difference in the dry-etch resistance, and nanometer-scale dot patterns can be easily obtained on the substrates. Regarding the application of this nano-patterning technique, we demonstrated the first circumferential magnetic patterned media for hard disk, which were prepared on a 2.5-inch diameter glass plate.

No abstract

We consider certain supersymmetric configurations of intersecting branes and branes ending on branes and analyze the duality between their open and closed string interpretation. The examples we study are chosen such that we have the lower dimensional brane realizing an n + 1 dimensional conformal field theory on its worldvolume and the higher dimensional one introducing a conformal boundary. We also consider two CFTs, possibly with different central charges, interacting along a common conformal boundary. We show with a probe calculation that the dual closed string description is in terms of gravity in an AdS n+2 bulk with an AdS n+1 defect or two different AdS n+2 spaces joined along a defect. We also comment briefly on the expected back-reaction.